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Other Comprehensive Income (Loss) - Schedule of Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances $ 649,765 $ 657,492 $ 617,390 $ 728,941
Other comprehensive income before reclassifications (13,237) (43,449) 7,341 (123,854)
Amounts reclassified from accumulated other comprehensive (loss) income 5,563 429 5,828 935
Other comprehensive loss (7,674) (43,020) 13,169 (122,919)
Ending balances 636,441 624,318 636,441 624,318
Available-for- Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (158,225) (94,965) (178,803) (14,560)
Other comprehensive income before reclassifications (13,237) (43,449) 7,341 (123,854)
Amounts reclassified from accumulated other comprehensive (loss) income 5,325 0 5,325 0
Other comprehensive loss (7,912) (43,449) 12,666 (123,854)
Ending balances (166,137) (138,414) (166,137) (138,414)
Employee Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (29,621) (40,884) (29,886) (41,390)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive (loss) income 238 429 503 935
Other comprehensive loss 238 429 503 935
Ending balances (29,383) (40,455) (29,383) (40,455)
Accumulated Other Comprehensive (Loss) Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (187,846) (135,849) (208,689) (55,950)
Other comprehensive loss (7,674) (43,020) 13,169 (122,919)
Ending balances $ (195,520) $ (178,869) $ (195,520) $ (178,869)